{"product_id":"red-line-d4-synthetic-automatic-transmission-fluid-atf-1-qt-4-pack-multi-application-cold-flow-protection","title":"Red Line D4 Synthetic Automatic Transmission Fluid (ATF) 1 qt 4-Pack — Multi-Application, Cold-Flow Protection","description":"\u003cp\u003e\u003cstrong\u003eRed Line 30504 D4 Synthetic Automatic Transmission Fluid is a high-performance, multi-application ATF formulated to protect gears, improve cold shifting, and work across many automatic and manual transmissions.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis synthetic ATF from Red Line delivers balanced friction characteristics for smoother shifts and strong gear protection without over-compatibility issues. Supplied as a convenient 1-quart bottle sold in a four-pack, it’s designed to replace or supplement a wide range of legacy ATF specifications—making it a practical choice for enthusiasts and professional technicians who service diverse vehicles.\u003c\/p\u003e\n\n\u003ch3\u003eWhat vehicles and transmissions will this ATF work with?\u003c\/h3\u003e\n\u003cp\u003eRed Line D4 is engineered as a versatile fluid suitable for many automatic and manual gearboxes that specify Dexron, Mercon, or similar charted fluids. It’s commonly used in older Japanese and European automatics and fits several manual transaxles when a GL-4 level gear protection is acceptable.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with Dexron III, Dexron II, Mercon, Mercon V service intervals and specifications\u003c\/li\u003e\n  \u003cli\u003ePopular for Toyota Type T-III\/T-IV, Honda ATF-Z1, Nissan Matic D\/J\/K\u003c\/li\u003e\n  \u003cli\u003eSuitable for some BMW, Audi and VW automatic transmissions (check manufacturer guidance)\u003c\/li\u003e\n  \u003cli\u003eAlso appropriate in manual transmissions such as T-5, T-45, T-56 where GL-4 protection is required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this ATF improve cold-weather shifting and gear life?\u003c\/h3\u003e\n\u003cp\u003eThe D4 formula balances slipperiness and clutch friction to enable easier, cleaner shifts in low temperatures while still protecting synchronizer rings and gears under load. That balance helps reduce harsh engagement and wear during cold starts and repeated shifts.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eLower pour point for improved flow at cold startup\u003c\/li\u003e\n  \u003cli\u003eControlled friction modifiers for smooth engagement and downshifts\u003c\/li\u003e\n  \u003cli\u003eGear and synchro protection to limit wear during heavy use\u003c\/li\u003e\n  \u003cli\u003eSynthetic base stocks for stable performance across temperature extremes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I use Red Line D4 in power steering or older manual transmissions?\u003c\/h3\u003e\n\u003cp\u003eYes—this fluid’s formulation supports use in some power steering systems and many manual transmissions, provided the manufacturer allows ATF or GL-4 gear oils. Always confirm with your vehicle’s service manual before substituting fluids.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAcceptable where automatic-transmission fluids are specified for power steering\u003c\/li\u003e\n  \u003cli\u003eProvides GL-4 level protection for many manual transaxles and synchronizers\u003c\/li\u003e\n  \u003cli\u003eUseful as a single, multi-application inventory fluid for shops or DIYers\u003c\/li\u003e\n  \u003cli\u003eCheck OEM approvals and seals compatibility to avoid warranty or component issues\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy choose this four-pack of 1-quart bottles instead of single bottles?\u003c\/h3\u003e\n\u003cp\u003eBuying the 1-quart four-pack reduces waste, keeps a ready supply for routine service, and lowers per-quart cost for projects that need multiple quarts. It’s a practical option for owners of multiple vehicles, performance shops, or anyone who prefers to top up fluids without opening new containers frequently.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEconomical per-quart pricing compared with single retail bottles\u003c\/li\u003e\n  \u003cli\u003eKeeps workspaces organized with identical, resealable bottles\u003c\/li\u003e\n  \u003cli\u003eHandy for fleet maintenance or multi-vehicle households\u003c\/li\u003e\n  \u003cli\u003eIdeal for prepping a complete fluid change without multiple orders\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Red Line 30504 D4 Synthetic ATF (1 Quart, 4 Pack) is aimed at automotive enthusiasts, independent mechanics, and professional shops that need a flexible, high-performance transmission fluid. It’s particularly useful for those who service a variety of older automatic and manual transmissions and want a reliable synthetic ATF with strong cold-weather shifting and gear protection properties. Always cross-reference your vehicle’s fluid specifications before use.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is Red Line D4 compatible with Dexron and Mercon fluids?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. D4 is formulated to work where Dexron II\/III and Mercon\/Mercon V are recommended; verify vehicle specs first.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use this ATF in manual transmissions?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Often yes—Red Line D4 provides GL-4 level protection suitable for many manual transaxles, pending OEM approval.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Red Line","offers":[{"title":"Default Title","offer_id":48079809609886,"sku":"B0041EDXGY","price":100.97,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/red-line-30504-bottle-front.jpg?v=1785771350","url":"https:\/\/northtrailauto.ca\/products\/red-line-d4-synthetic-automatic-transmission-fluid-atf-1-qt-4-pack-multi-application-cold-flow-protection","provider":"North Trail Auto","version":"1.0","type":"link"}